X/Y Microphone Placement@Stereo microphone recording technique. Two cardiod microphones are placed facing each other, usually at an angle of 90û, with the center of the sound source at the apex of this angle. Some stereo microphones incorporate this placement internally between their two capsules.@XLR, Cannon Connector@A type of audio connector; most familiar as the 3-pin "microphone" plug. On a 3-pin XLR plug wired used for balanced lines, pin 2 should be "hot" (+), pin 3 "neutral" (-), and pin 1 "ground" (shield). In certain applications (particularly some video production environments), pin 2 may NOT be hot; even though this standard was generally agreed to in about 1994. Other variants include 5- and 7-pin XLR connectors, used for some headphones, stereo mikes and intercom systems. Originally manufactured by the Cannon Company, now available from numerous sources. See Balanced Line.@